In this tutorial, we will go through a working example of a Node.js application auto-instrumented with OpenTelemetry. In our example, we’ll use Express, the popular Node.js web application framework.
Our example application is based on two locally hosted services sending data to each other. We will instrument this application with OpenTelemetry’s Node.js client library to generate trace data and send it to an OpenTelemetry Collector. The Collector will then export the trace data to an external distributed tracing analytics tool of our choice.